You want to… Write Notes
Say A which-is B A [B] The brackets are the which-is verb
Give B a property A [B + prop [val]] + opens a has-a slot on the entity
Annotate the claim, not the entity A [B - prop [val]] - hangs off the association in scope
List synonyms / translations [Pluto | 冥王星] | separates expression alternatives
List several things [Charon, Nix, Hydra] , (comma-space) = several concepts
Tag a surface form's language Pluto{en} Tight braces, no space — expression scope
Add permanent concept metadata Pluto {{~1.0, 1930-02-18}} {{…}} — one block per position
Add association/temporal metadata [planet {1930/2006}] {…} — only when an association exists
State a validity interval {1930-02-18/2006-08-24} or {{12 Nov 2024 7:00 am +11:00/1 hour}} Prefer start/duration for timed events; {2006-08-24/} = ongoing
Timed event (metadata) when [{{12 Nov 2024 7:00 am +11:00/1 hour}}] Friendly or ISO TemporalSpec in {{…}}
Timed event (expression-first) when [12 Nov 2024 7 am / 1 hour] Whole expression matches TemporalSpec → auto temporal metadata
Confidence / importance ~0.99 / +2 Inside a metadata block
Name a concept for reuse [{{@pluto}} Pluto] then @pluto Register in {{…}}/{…}; later bare = lookup
Link to the web [<http://…>] Angle brackets = IRI
Map to a standard predicate name | schema:name [Pluto] Human + standard as alternatives
Comment # … (space before inline #) Stripped at parse; not in the graph

The two rules to remember: (1) there are only two verbs — which-is [] and has-a +/-; (2) metadata never follows a closing ] — put it inside, adjacent to what it describes.